package aspect;

import java.security.MessageDigest;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

import pojo.User;

@Component
@Aspect
public class LogAspect {

	private final String pointcut = "execution(* service.UserService.*User(..))";

	@Around(value = pointcut)
	public Object logAround(ProceedingJoinPoint point) {
		User u = (User) point.getArgs()[0];
		Object o = null;
		System.out.println("log arround before...");
		try {
			// call target
			u.setPwd(getSha1(u.getPwd()));
			o = point.proceed(new Object[] { u });

		} catch (Throwable e) {
			e.printStackTrace();
		}
		System.out.println("log arround after...");

		return o;

	}

	private static String getSha1(String str) {
		if (str == null || str.length() == 0) {
			return null;
		}
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
				'a', 'b', 'c', 'd', 'e', 'f' };

		try {
			MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
			mdTemp.update(str.getBytes("UTF-8"));

			byte[] md = mdTemp.digest();
			int j = md.length;
			char buf[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
				buf[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(buf);
		} catch (Exception e) {
			return null;
		}
	}

}
